Hey! Welcome to Gibson Forums!
Your guitar, if the same as the picture, looks really nice.
Are you sure it is a one-piece body? I also thought that on several Epi's I've owned but I realised that they are very well glued, you can hardly see the joints on the back but you can see them very clearly below (if it is a trans back).
Perhaps your model is not, has not been and won't be listed on Epiphone's website, there are dozens of models that never get listed there.
Congrats for your purchase!